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Message from discussion submodule paths and DrRacket
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Asumu Takikawa  
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 More options Nov 18 2012, 9:36 pm
From: Asumu Takikawa <as...@ccs.neu.edu>
Date: Sun, 18 Nov 2012 21:31:49 -0500
Local: Sun, Nov 18 2012 9:31 pm
Subject: Re: [racket] submodule paths and DrRacket
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On 2012-11-18 21:10:25 -0500, Harry Spier wrote:

>    Case 1 as follows works in the DrRacket Definitions window but doesn't
>    work in the Interactions window

>    #lang racket

>    (module m racket
>      (provide color)
>      (define color "blue"))
>    (module n racket
>      (require (submod ".." m))
>      (printf "my favorite color is ~a\n" color))

In the definitions window, the use of #lang implicitly wraps the entire
contents of the window in a module. This allows the use of relative
submodule references to module `m`.

In the interactions window, you are defining top-level modules instead.
You can get the same behavior if you wrap both `m` and `n` in another
module in the interactions window:

  (module around racket
    ;; put m and n here
    ...)

>    Case 2 as follows works in the DrRacket Interactions window but doesn't
>    work in the Definitions window

>    > (module m racket
>        (provide color)
>        (define color "blue"))
>      (module n racket
>        (require 'm)
>        (printf "my favorite color is ~a\n" color))
>      (require 'n)

This time, it works in the interactions window because they are both
top-level modules. Within a module, you can't refer to the parent's
submodules directly with a quoted name.

>    Also is there a way to have

>     #lang racket

>     (module m racket
>       (provide color)
>       (define color "blue"))

>    in the definitions window but the following in the interactions window

>    >(module n racket
>       (require SOME SUBMODULE PATH TO m)
>       (printf "my favorite color is ~a\n" color))
>     (require 'n)

Yes. Suppose the first snippet is defined in "foo.rkt". Then you can
just have (require (submod "foo.rkt" m)) if you're in the right
directory.

Cheers,
Asumu
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